Add a local copy of cpanm

Easier to bootstrap systems

Signed-off-by: Pedro Melo <melo@simplicidade.org>
Tweak post_deploy.sh:

 * environment to deploy is now a parameter;
 * allow for multiple cpanfiles with deps to install;
 * disable LANG when using cpanm: some modules (eg. DBD::ODBC) complain;
 * make service setup optional: no $HOME/service, skip it.

Signed-off-by: Pedro Melo <melo@simplicidade.org>
Add sample config file for a upstart-based service

Signed-off-by: Pedro Melo <melo@simplicidade.org>